.about-us{
    width: 1200px;
    height: 900px;
    margin: 0 auto;
}
/*第一部分---------------------------------------------------*/

/*第二部分 图片---------------------------------------------*/
.about-us>div:nth-child(2){
    margin-top: 30px;
    width: 1200px;
    height: 350px;
    background-size: 100% 100%;
    border: 1px solid transparent;
}
.about-us>div:nth-child(2)>div{
    text-align: center;
    font-size: 60px;
    color: rgb(10, 204, 206);
    line-height: 160px;
    margin: 100px auto 0 auto;
    width: 160px;
    height: 160px;
    background-color: rgba(255,255,255,0.5);
    border-radius: 90px 90px;
}
 第三部分 ------------------------------------------------
.about-us>div:nth-child(3){
    margin-top: 30px;
    width: 1200px;
    height: 420px;
}
/*一四段*/
.about-us>div:nth-child(3)>div:nth-child(1){
    margin-top: 10px;
    width: 1200px;
    height: 60px;
    font-size: 14px;
    line-height: 200%;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}
.about-us>div:nth-child(3)>div:nth-child(4){
    margin-top: 10px;
    width: 1200px;
    height: 60px;
    font-size: 14px;
    line-height: 200%;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}
/*二段*/
.about-us>div:nth-child(3)>div:nth-child(2){
    margin-left: 22px;
    height: 80px;
    width: 1100px;
    font-size: 14px;
    line-height: 200%;
}
/*第三段*/
.about-us>div:nth-child(3)>div:nth-child(3){
    height: 160px;
    width: 1200px;
    margin-top: 10px;
    font-size: 14px;
    line-height: 200%;
}

.about-us>div:nth-child(3)>div:nth-child(3)>p{
    text-indent: 2em;
}